{"paper":{"title":"Fragmentation of charm to charmonium in $e^+e^-$ and $pp$ collisions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"B.Z. Kopeliovich, S.P. Baranov","submitted_at":"2018-03-02T22:32:54Z","abstract_excerpt":"We perform numerical comparison of the fragmentation mechanism of charmonium production ($g\\,g\\to c\\,\\bar{c}$ followed by $c\\to\\psi\\,c$) with the full leading order calculation ($g\\,g\\to\\psi\\,c\\,\\bar{c}$ at ${\\O} (\\alpha_s^4)$). We conclude that the non-fragmentation contributions remain important up to $J/\\psi$ transverse momenta about as large as 50 GeV, thus making questionable the applicability of the fragmentation approximation at smaller transverse momenta."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.01060","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}